System for broadcasting a temporal reference in an aircraft

1. A system for broadcasting an avionics temporal reference in an aircraft, the system comprising: an avionics multimode reception apparatus configured to generate a reference time according to a satellite geolocation; a master clock in the aircraft configured to generate the avionics temporal reference using the reference time and to wirelessly broadcast the avionics temporal reference to avionics devices linked by a wireless communication network for the aircraft, wherein the master clock is configured to broadcast the temporal reference on first and second wireless pathways according to respectively first and second predetermined frequencies included in a frequency band dedicated to wireless internal avionics communications within the wireless communication network and wherein the temporal reference is applied to synchronize internal clocks in the avionics devices.

2. The system according to claim 1 , wherein the master clock is configured to use a time synchronization protocol on the wireless avionics network.

3. The system according to claim 1 , wherein the master clock is configured to emit the avionics temporal reference by radio wave of which a frequency of a carrier for the radio wave lies in the frequency band dedicated to the wireless internal avionics communications.

4. The system according to claim 1 , wherein the internal clock of each of the avionics devices comprises an apparatus configured for regulation and time-setting.

5. The system accordingly to claim 1 , wherein the avionics devices are adapted to receive the avionics temporal reference, and each of the avionics devices is configured to couple a reception value of the avionics temporal reference with the internal clock of the avionics device to deduce a common avionics reference time.

6. The system according to claim 5 , wherein each of the avionics devices comprises a redundancy manager configured to account for redundancy of the first and second wireless pathways.

7. The system according to claim 1 , wherein the frequency band dedicated to the wireless internal avionics communications is a wireless avionics intra communication frequency band.

8. The system according to claim 6 , wherein the redundancy manager is configured to operate according to a predetermined management logic including at least one of: the avionics temporal reference used corresponds to that received first via the first wireless pathway or the second wireless pathway, the avionics temporal reference used corresponds to that received via a single wireless pathway selected from among the first and second wireless pathways and in case of signal loss on the single wireless pathway, then the avionics temporal reference used corresponds to that received via the first or second wireless pathways which is not the single wireless pathway, and the avionics temporal reference received corresponds to an average of the avionics temporal reference received via the first wireless pathway and the avionics temporal reference received via the second wireless pathway, and in case of signal loss on one of the first and second wireless pathways, then only the avionics temporal reference received via another of the first and second wireless pathway is used.

9. An aircraft comprising the system according to claim 5 .

10. A method to broadcast an avionics temporal reference over a set of avionics devices in an aircraft, the method comprising: generating, by an avionics multimode reception apparatus in the aircraft, a reference time based on a satellite geolocation; generating, by a master clock in an avionics device in the aircraft, the avionics temporal reference based on the reference time; broadcasting of the avionics temporal reference via a wireless communication network in the aircraft on first and second wireless pathways according to respectively first and second predetermined frequencies included in a frequency band dedicated to wireless internal avionics communications within in the aircraft; receiving by avionics devices in the wireless communication network the avionics temporal reference via the first and second wireless pathways, and synchronizing clocks in each of the avionics devices using the avionics temporal reference.

11. A method to synchronize clocks in avionics devices in a wireless communication network in an aircraft, the method comprises: generating, by an avionics multimode reception apparatus, a reference time based on a satellite geolocation; generating, by a master clock in an avionics platform of the aircraft, a temporal reference signal based on the reference time; outputting the temporal reference signal by the master clock; periodically transmitting wirelessly the temporal reference signal over at least two frequencies in a frequency band dedicated to wireless internal avionics communication network in the aircraft; receiving the temporal reference signal transmitted wirelessly by receivers in each of the avionics devices, wherein each of the receivers receive the temporal reference signal over the at least two frequencies; synchronizing internal clocks in each of the avionics devices using the temporal reference signal.

12. The method of claim 11 further comprising: each of the avionics devices averaging the temporal reference signals received over the at least two frequencies to generate an averaged temporal reference signal; using the averaged temporal signal to perform the synchronization of each of the internal clocks in the avionics devices; and if the temporal signal is received over only one of the at least two frequencies at least one of the avionics devices, using the temporal signal received over the only one of the at least two frequencies to perform the synchronization in the internal clock for the at least one of the avionics devices.

13. The method of claim 11 , wherein the step of periodically transmitting wirelessly the temporal reference signal is performed at intervals no longer than 500 ms.